<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <div id="app">
            <div>名：<input type="text" v-model="firstName" /></div>
            <div>姓：<input type="text" v-model="lastName" /></div>
            <div>{{fullName}}</div>
        </div>
        <script src="./lib/vue.js"></script>
        <script>
            var app = new Vue({
                el: '#app',
                data: {
                    firstName: 'Jim',
                    lastName: 'Green'
                    // fullName: 'Jin Green'
                },
                computed: {
                    fullName: function() {
                        return this.firstName + ' ' + this.lastName;
                    }
                },
                watch: {
                    // firstName: function(val) {
                    //     this.fullName = val + ' ' + this.lastName;
                    // },
                    // lastName: function(val) {
                    //     this.fullName = this.firstName + ' ' + val;
                    // }
                }
            });
        </script>
    </body>
</html>
